diff --git a/.github/workflows/cicd_workflow.yml b/.github/workflows/cicd_workflow.yml
new file mode 100644
index 0000000..7cf8e67
--- /dev/null
+++ b/.github/workflows/cicd_workflow.yml
@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches: [ "hw1" ]
+  pull_request:
+    branches: [ "main" ]
+
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    container: leshiy1295/gcc_linters_valgrind_cmake_gtest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: build
+      run: cmake ./hw1 -B ./hw1/build
+
+    - name: make & run
+      # Build your program with the given configuration
+      working-directory: ./hw1/build
+      run: |
+        make
+        ./solution
+
+    - name: test
+      working-directory: ./hw1/build/tests
+      run: ./test_solution
+
+    - name: test coverage 
+      working-directory: ./hw1/build
+      run: |
+        apt install lcov -y
+        lcov -t "tests/test_solution" -o coverage.info -c -d src
+        genhtml -o report coverage.info
+
+    - name: valgrind
+      working-directory: ./hw1/build/
+      run:  valgrind --tool=memcheck --leak-check=yes ./solution
+
+    - name: valgrind test
+      working-directory: ./hw1/build/tests
+      run:  valgrind --tool=memcheck --leak-check=yes ./test_solution
+
diff --git a/hw1/CMakeLists.txt b/hw1/CMakeLists.txt
new file mode 100644
index 0000000..9931089
--- /dev/null
+++ b/hw1/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.14)
+project(solution)
+
+set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} "-lm -Wall -Wpedantic -Wextra -Werror -fprofile-arcs -ftest-coverage -O0")
+
+add_subdirectory(src)
+
+message("PRINTER_LIB_INCLUDE_DIRS = ${SRC_LIB_INCLUDE_DIR}")
+message("PRINTER_LIB_LIBRARIES = ${SRC_LIB_LIBRARIES}")
+
+add_executable(${PROJECT_NAME} main.c)
+
+#set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -coverage -lgcov" )
+
+target_include_directories(${PROJECT_NAME} PUBLIC ${SRC_LIB_INCLUDE_DIR})
+target_link_libraries(${PROJECT_NAME} PRIVATE ${SRC_LIB_LIBRARIES})
+
+add_subdirectory(tests)
\ No newline at end of file
diff --git a/hw1/README.md b/hw1/README.md
new file mode 100644
index 0000000..fff95b9
--- /dev/null
+++ b/hw1/README.md
@@ -0,0 +1 @@
+Составить программу нахождения минимальной площади грани тетраэдра, заданного 4 вершинами. Оформить решение в виде функции, принимающей на вход указатели на координаты вершин тетраэдра. На выходе функция должна возвращать указатель на значение площади наименьшей грани.
\ No newline at end of file
diff --git a/hw1/main.c b/hw1/main.c
new file mode 100644
index 0000000..498c7d5
--- /dev/null
+++ b/hw1/main.c
@@ -0,0 +1,37 @@
+#include<stdio.h>
+#include"solution.h"
+#include<stdlib.h>
+
+int main(){
+    FILE* fp = fopen("../test.txt","r");
+    if (!fp){
+        return -1;
+    }
+    Point* a = malloc(sizeof(Point));
+    Point* b = malloc(sizeof(Point));
+    Point* c = malloc(sizeof(Point));
+    Point* d = malloc(sizeof(Point));
+
+    if (fscanf(fp, "%f %f %f", &a->x, &a->y, &a->z) != 3){
+        return -1;
+    }
+    if (fscanf(fp, "%f %f %f", &b->x, &b->y, &b->z) != 3){
+        return -1;
+    };
+    if (fscanf(fp, "%f %f %f", &c->x, &c->y, &c->z) != 3){
+        return -1;
+    };
+    if (fscanf(fp, "%f %f %f", &d->x, &d->y, &d->z) != 3){
+        return -1;
+    };
+    fclose(fp);
+
+    float* result = min_area_tetrahedron(a, b, c, d);
+    printf("result %f, %p \n", *result, (void *) result);
+
+    free(a);
+    free(b);
+    free(c);
+    free(d);
+    return 0;
+}
diff --git a/hw1/src/CMakeLists.txt b/hw1/src/CMakeLists.txt
new file mode 100644
index 0000000..3d3c7df
--- /dev/null
+++ b/hw1/src/CMakeLists.txt
@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.0.0)
+project(solution_lib)
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fprofile-arcs -ftest-coverage -O0")
+
+file(GLOB SOURCES *.c)
+file(GLOB INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR})
+
+add_library(${PROJECT_NAME} STATIC ${SOURCES})
+
+set(SRC_LIB_LIBRARIES ${PROJECT_NAME} PARENT_SCOPE)
+set(SRC_LIB_INCLUDE_DIR ${INCLUDE_DIRS} PARENT_SCOPE)
\ No newline at end of file
diff --git a/hw1/src/solution.c b/hw1/src/solution.c
new file mode 100644
index 0000000..0deb259
--- /dev/null
+++ b/hw1/src/solution.c
@@ -0,0 +1,73 @@
+#include"solution.h"
+#include<math.h>
+#include<stdlib.h>
+#include<stdio.h>
+
+Vector* cross_product(Vector* a, Vector* b){
+    if (!a || !b){
+        return NULL;
+    }
+    Vector* v = malloc(sizeof(Vector));
+    v->i = a->k * b->j - a->j * b->k;
+    v->j = a->i * b->k - a->k * b->i;
+    v->k = a->j * b->i - a->i * b->j;
+    return v;
+}
+
+float vector_norm(Vector* v){
+    if (!v){
+        return -1;
+    }
+    return sqrt((v->i * v->i + v->j * v->j + v->k * v->k));
+}
+
+float area_triangle(Point* a, Point* b, Point* c){
+    if (!a || !b || !c){
+        return -1;
+    }
+    Vector* v = malloc(sizeof(Vector));
+    v->i = c->x - a->x;
+    v->j = c->y - a->y;
+    v->k = c->z - a->z;
+
+    Vector* u = malloc(sizeof(Vector));
+    u->i = b->x - a->x;
+    u->j = b->y - a->y;
+    u->k = b->z - a->z;
+
+    Vector* w = cross_product(v, u);
+    w->i = w->i / 2;
+    w->j = w->j / 2;
+    w->k = w->k / 2;
+    free(v);
+    free(u);
+
+    float area = vector_norm(w);
+    free(w);
+
+    return area;
+}
+
+float* min_area_tetrahedron(Point* a, Point* b, Point* c, Point* d){
+    if (!a || !b || !c || !d){
+        return NULL;
+    }
+    static float min_area;
+    
+    const float s0 = area_triangle(a, b, c);
+    const float s1 = area_triangle(a, b, d);
+    const float s2 = area_triangle(a, c, d);
+    const float s3 = area_triangle(b, c, d);
+    min_area = s0;
+
+    if (min_area > s1){
+        min_area = s1;
+    }
+    if (min_area > s2){
+        min_area = s2;
+    }
+    if (min_area > s3){
+        min_area = s3;
+    }
+    return &min_area;
+}
diff --git a/hw1/src/solution.h b/hw1/src/solution.h
new file mode 100644
index 0000000..880f7a8
--- /dev/null
+++ b/hw1/src/solution.h
@@ -0,0 +1,19 @@
+typedef struct Point{
+    float x;
+    float y;
+    float z;
+} Point;
+
+typedef struct Vector{
+    float i;
+    float j;
+    float k;
+} Vector;
+
+Vector* cross_product(Vector* a, Vector* b);
+
+float vector_norm(Vector* v);
+
+float area_triangle(Point* a, Point* b, Point* c);
+
+float* min_area_tetrahedron(Point* a, Point* b, Point* c, Point* d);
diff --git a/hw1/test.txt b/hw1/test.txt
new file mode 100644
index 0000000..1a0340c
--- /dev/null
+++ b/hw1/test.txt
@@ -0,0 +1,4 @@
+0 0 0 
+0 0 3
+0 1 0
+2 0 0
\ No newline at end of file
diff --git a/hw1/tests/CMakeLists.txt b/hw1/tests/CMakeLists.txt
new file mode 100644
index 0000000..fdd1da6
--- /dev/null
+++ b/hw1/tests/CMakeLists.txt
@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.14)
+project(test_solution)
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-fprofile-arcs -ftest-coverage -O0 -fsanitize=address,undefined -fno-sanitize-recover=all -fsanitize-undefined-trap-on-error")
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -coverage -lgcov" )
+
+file(GLOB SOURCES *.cpp)
+
+find_package(GTest REQUIRED)
+
+add_executable(${PROJECT_NAME} ${SOURCES})
+target_include_directories(${PROJECT_NAME} PUBLIC ${SRC_LIB_INCLUDE_DIR})
+target_link_libraries(${PROJECT_NAME} ${SRC_LIB_LIBRARIES} GTest::gtest_main)
\ No newline at end of file
diff --git a/hw1/tests/solution_test.cpp b/hw1/tests/solution_test.cpp
new file mode 100644
index 0000000..b8fb907
--- /dev/null
+++ b/hw1/tests/solution_test.cpp
@@ -0,0 +1,77 @@
+#include <gtest/gtest.h>
+#include<stdio.h>
+#include<stdlib.h>
+
+extern "C" {
+    #include<solution.h>
+}
+
+TEST(Src, TestBasics) {
+    FILE* fp = fopen("../../test.txt","r");
+    Point *a = (Point*) malloc(sizeof(Point));
+    Point *b = (Point*) malloc(sizeof(Point));
+    Point *c = (Point*) malloc(sizeof(Point));
+    Point *d = (Point*) malloc(sizeof(Point));
+
+    fscanf(fp, "%f %f %f", &a->x, &a->y, &a->z);
+    fscanf(fp, "%f %f %f", &b->x, &b->y, &b->z);
+    fscanf(fp, "%f %f %f", &c->x, &c->y, &c->z);
+    fscanf(fp, "%f %f %f", &d->x, &d->y, &d->z);
+    fclose(fp);
+
+    float * result;
+    result = min_area_tetrahedron(a, b, c, d);
+    
+    EXPECT_FLOAT_EQ(1, *result);
+    free(a);
+    free(b);
+    free(c);
+    free(d);
+}
+
+TEST(Src, TestBasicsPermute1) {
+    FILE* fp = fopen("../../test.txt","r");
+    Point *a = (Point*) malloc(sizeof(Point));
+    Point *b = (Point*) malloc(sizeof(Point));
+    Point *c = (Point*) malloc(sizeof(Point));
+    Point *d = (Point*) malloc(sizeof(Point));
+
+    fscanf(fp, "%f %f %f", &b->x, &b->y, &b->z);
+    fscanf(fp, "%f %f %f", &a->x, &a->y, &a->z);
+    fscanf(fp, "%f %f %f", &c->x, &c->y, &c->z);
+    fscanf(fp, "%f %f %f", &d->x, &d->y, &d->z);
+    fclose(fp);
+
+    float * result;
+    result = min_area_tetrahedron(a, b, c, d);
+    
+    EXPECT_FLOAT_EQ(1, *result);
+    free(a);
+    free(b);
+    free(c);
+    free(d);
+}
+
+TEST(Src, TestBasicsPermute2) {
+    FILE* fp = fopen("../../test.txt","r");
+
+    Point *a = (Point*) malloc(sizeof(Point));
+    Point *b = (Point*) malloc(sizeof(Point));
+    Point *c = (Point*) malloc(sizeof(Point));
+    Point *d = (Point*) malloc(sizeof(Point));
+
+    fscanf(fp, "%f %f %f", &b->x, &b->y, &b->z);
+    fscanf(fp, "%f %f %f", &c->x, &c->y, &c->z);
+    fscanf(fp, "%f %f %f", &a->x, &a->y, &a->z);
+    fscanf(fp, "%f %f %f", &d->x, &d->y, &d->z);
+    fclose(fp);
+
+    float * result;
+    result = min_area_tetrahedron(a, b, c, d);
+    
+    EXPECT_FLOAT_EQ(1, *result);
+    free(a);
+    free(b);
+    free(c);
+    free(d);
+}